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100+ Free Arab Board Dermatology Part 1 Practice Questions

Prepare for the Arab Board Dermatology and Venereology Part 1 Written Examination (ABHS) exam with instant access — no signup required.

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Sample Arab Board Dermatology Part 1 Practice Questions

Try these sample questions to test your Arab Board Dermatology Part 1 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which keratin pair constitutes the primary intermediate filament network within the basal layer of the stratified squamous epidermis?
A.Keratin 5 and Keratin 14
B.Keratin 1 and Keratin 10
C.Keratin 6 and Keratin 16
D.Keratin 8 and Keratin 18
Explanation: Keratins 5 (type II) and 14 (type I) form the primary heterodimer intermediate filament cytoskeleton in the basal layer of the epidermis, anchoring to hemidesmosomes and desmosomes. Mutations in either KRT5 or KRT14 genes result in fragility of the basal cell layer, leading to epidermolysis bullosa simplex (EBS).
2As basal keratinocytes commit to terminal differentiation and migrate into the stratum spinosum, which major keratin pair is transcriptionally upregulated to replace K5/K14?
A.Keratin 3 and Keratin 12
B.Keratin 1 and Keratin 10
C.Keratin 4 and Keratin 13
D.Keratin 2e and Keratin 9
Explanation: Upon post-mitotic upward migration into the stratum spinosum, keratinocytes downregulate K5/K14 and upregulate the differentiation-specific pair Keratin 1 (type II) and Keratin 10 (type I). Pathogenic mutations in KRT1 or KRT10 disrupt suprabasal filament assembly, causing epidermolytic ichthyosis (formerly bullous congenital ichthyosiform erythroderma).
3Which calcium-dependent enzyme is primarily responsible for cross-linking structural proteins such as loricrin, involucrin, and envoplakin during the formation of the cornified cell envelope?
A.Transglutaminase-1
B.Steroid sulfatase
C.Acid ceramidase
D.Protein kinase C
Explanation: Transglutaminase-1 (TGase-1 / TGM1), a membrane-anchored calcium-dependent enzyme, catalyzes the formation of covalent N-(gamma-glutamyl)lysine isopeptide bonds between precursor structural proteins (loricrin, involucrin, small proline-rich proteins) to assemble the cornified cell envelope. Inactivating mutations in TGM1 are the most common cause of autosomal recessive congenital ichthyosis (lamellar ichthyosis).
4Profilaggrin, stored within keratohyalin granules of the stratum granulosum, is proteolytically processed into functional filaggrin monomers that bundle keratin intermediate filaments. What is the ultimate fate of filaggrin in the upper stratum corneum?
A.Degradation into hygroscopic amino acids forming natural moisturizing factor (NMF)
B.Covalent incorporation into the desmosomal inner dense plaque
C.Secretion into the intercellular space as a lamellar lipid bilayer
D.Phosphorylation to form tight junction barrier strands
Explanation: In the outer stratum corneum, filaggrin is dephosphorylated and broken down by proteases (including caspase-14, calpain-1, and bleomycin hydrolase) into free amino acids and their derivatives (e.g., pyrrolidone carboxylic acid and urocanic acid). These hydrophilic molecules constitute the natural moisturizing factor (NMF), which maintains stratum corneum hydration and acidic surface pH.
5Which organelle synthesized in the stratum spinosum and granulosum contains glucosylceramides, sphingomyelin, cholesterol, and antimicrobial peptides destined for secretion into the intercellular space?
A.Lamellar granules (Odland bodies)
B.Birbeck granules
C.Weibel-Palade bodies
D.Melanosomes
Explanation: Lamellar granules (also called Odland bodies, membrane-coating granules, or cementosomes) are specialized lipid-storage secretory organelles of the upper epidermis. They fuse with the apical cell membrane of granular cells to extrude polar lipid precursors (glucosylceramides, sphingomyelin) and hydrolytic processing enzymes, creating the mature lipid barrier (ceramides, cholesterol, free fatty acids).
6According to the desmoglein compensation theory, why does mucosal involvement occur in pemphigus vulgaris but NOT in pemphigus foliaceus?
A.Desmoglein-3 is heavily expressed throughout mucosal epithelia and compensates for Dsg1, while Dsg1 alone is targeted in foliaceus
B.Mucosal epithelium completely lacks desmosomes and relies entirely on hemidesmosomes
C.Desmoglein-1 is expressed at higher levels in mucous membranes than in skin epidermis
D.Pemphigus foliaceus antibodies target desmocollin-3 rather than desmoglein isoforms
Explanation: Desmoglein-3 (Dsg3) is expressed throughout the entire thickness of mucosal stratified epithelium, whereas Desmoglein-1 (Dsg1) is expressed only minimally in mucosa. In pemphigus foliaceus, autoantibodies target only Dsg1, so high mucosal Dsg3 compensates and prevents blister formation; in mucosal pemphigus vulgaris, autoantibodies target Dsg3, which causes mucosal blistering because mucosal Dsg1 is insufficient to compensate.
7A mutation in which desmosomal plaque protein, responsible for anchoring keratin intermediate filaments to the inner desmosomal plaque, causes Carvajal syndrome (striate palmoplantar keratoderma, woolly hair, and dilated left ventricular cardiomyopathy)?
A.Desmoplakin
B.Plakoglobin
C.Involucrin
D.Corneodesmosin
Explanation: Carvajal syndrome is caused by recessive mutations in the DSP gene encoding desmoplakin, which links the desmosomal cadherins (via plakoglobin and plakophilin) to keratin filaments in skin and desmin in cardiac myocardium. Loss of functional desmoplakin causes epidermolysis-like mechanical instability, striate palmoplantar keratoderma, woolly hair, and left ventricular dilated cardiomyopathy.
8Which epidermal layer contains functional tight junctions (zonula occludens) composed of claudin-1, claudin-4, and occludin, providing a continuous paracellular barrier to fluid and macromolecular movement?
A.Stratum granulosum
B.Stratum basale
C.Stratum spinosum
D.Stratum corneum
Explanation: Functional tight junctions in mammalian epidermis are localized specifically to the stratum granulosum (SG2 layer). They form a continuous belt of transmembrane claudins (notably claudin-1 and -4) and occludin that seals the paracellular pathway against water, ions, and external antigens.
9Mutations in the GJB2 gene encoding connexin 26, a transmembrane gap junction protein that facilitates intercellular metabolic coupling, are associated with which clinical syndrome?
A.Vohwinkel syndrome (keratoderma hereditaria mutilans) and KID syndrome
B.Darier disease
C.Hailey-Hailey disease
D.Papillon-Lefèvre syndrome
Explanation: GJB2 encodes connexin 26, a hexameric gap junction channel protein expressed in palmoplantar epidermis and cochlear hair cells. Dominant mutations in GJB2 cause classic Vohwinkel syndrome (honeycomb keratoderma, pseudoainhum constricting bands, starfish keratoses, and sensorineural deafness) as well as Keratitis-Ichthyosis-Deafness (KID) syndrome.
10What is the normal physiologic transit time required for a newly generated basal keratinocyte to differentiate, migrate through the granular layer, and desquamate from the surface of the stratum corneum?
A.Approximately 28 days (14 days stratum basale to granulosum + 14 days stratum corneum)
B.Approximately 3 to 5 days
C.Approximately 60 to 75 days
D.Approximately 12 hours
Explanation: Under normal steady-state physiologic conditions, the total epidermal turnover time is approximately 28 to 30 days, consisting of roughly 14 days for migration from the basal layer through the granular layer, plus another 14 days for transit and shedding through the stratum corneum. In hyperproliferative conditions like plaque psoriasis, this transit time is drastically shortened to 3 to 5 days.

About the Arab Board Dermatology Part 1 Exam

The Arab Board Dermatology and Venereology Part 1 examination is the primary basic science qualification for dermatology residents across the Arab world. Administered by the Scientific Council of Dermatology and Venereology of the ABHS, this exam evaluates essential knowledge in epidermal biology, dermal-epidermal ultrastructure, melanocyte physiology, cutaneous immunology, skin appendages, dermatopathology, cutaneous microbiology, and basic dermatological pharmacology.

Assessment

A comprehensive single-paper written examination of single-best-answer multiple choice questions (MCQs) assessing core basic sciences and foundation dermatology principles.

Time Limit

Approximately 2.5 to 3 hours

Passing Score

Approximately 60%, determined by the ABHS Scientific Council.

Exam Fee

Set by ABHS and national councils; check with your regional accredited training authority. (Arab Board of Health Specializations (ABHS))

Arab Board Dermatology Part 1 Exam Content Outline

14%

Epidermal Biology and Differentiation

Keratinocyte kinetics, keratin pairs, desmosomal and junctional complexes, cornified envelope formation, and epidermal barrier physiology.

12%

Melanocyte Biology and Photobiology

Melanogenesis pathways, tyrosinase enzymology, melanosome transfer, ultraviolet radiation spectra, DNA photoproducts, and repair mechanisms.

12%

Dermis, Basement Membrane and Wound Healing

Collagen types, elastic fiber assembly, basement membrane zone proteins, extracellular matrix glycosaminoglycans, and phases of cutaneous wound repair.

12%

Skin Appendages and Hair/Nail Biology

Hair follicle morphogenesis and hair cycle regulation, sebaceous and sweat gland physiology, and nail unit microanatomy.

12%

Cutaneous Immunology and Vascular Biology

Langerhans and dendritic cell subsets, T-helper polarization (Th1/Th2/Th17/Treg), mast cell activation, cutaneous vascular plexuses, and innate antimicrobial peptides.

12%

Dermatopathology and Diagnostic Techniques

Histopathological tissue reaction patterns, spongiosis, acantholysis, interface dermatitis, granulomatous reactions, special histochemical stains, and direct immunofluorescence.

12%

Cutaneous Microbiology, Virology and Mycology

Bacterial virulence factors, dermatophyte classification, Malassezia biology, herpesviruses, papillomaviruses, leishmaniasis, and cutaneous parasitology.

14%

Dermatological Pharmacology and Therapeutics

Topical corticosteroid classes, retinoid nuclear receptor mechanisms, calcineurin inhibitors, phototherapy physics/dosimetry, systemic biologic agents, and monitoring protocols.

How to Pass the Arab Board Dermatology Part 1 Exam

What You Need to Know

  • Passing score: Approximately 60%, determined by the ABHS Scientific Council.
  • Assessment: A comprehensive single-paper written examination of single-best-answer multiple choice questions (MCQs) assessing core basic sciences and foundation dermatology principles.
  • Time limit: Approximately 2.5 to 3 hours
  • Exam fee: Set by ABHS and national councils; check with your regional accredited training authority.

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Arab Board Dermatology Part 1 Study Tips from Top Performers

1Master the molecular anatomy of the dermal-epidermal junction and desmosomal junctions, memorizing target antigens involved in immunobullous disorders such as BP180, BP230, desmoglein-1, desmoglein-3, and type VII collagen.
2Understand cutaneous immunology cascades thoroughly, including T-cell differentiation (Th1, Th2, Th17, Th22, Treg), cytokine receptors, and specific targets of modern biologic drugs like dupilumab, secukinumab, ustekinumab, and guselkumab.
3Review high-yield histopathology patterns and special stains (e.g., PAS, Ziehl-Neelsen, Fontana-Masson, Congo red, Alcian blue) alongside direct immunofluorescence patterns in lupus, pemphigus, and pemphigoid.

Frequently Asked Questions

What is the format and structure of the Arab Board Dermatology Part 1 Exam?

The Part 1 examination is a written assessment comprising 100 single-best-answer multiple choice questions (MCQs) delivered over 2.5 to 3 hours. It focuses strictly on the basic scientific foundations of dermatology and venereology.

What core subjects are tested on the Dermatology Part 1 examination?

The examination tests skin anatomy, ultrastructure, embryology, epidermal differentiation, melanocyte biology, hair and nail physiology, cutaneous immunology, basic dermatopathology patterns, cutaneous microbiology, mycology, virology, and basic dermatological pharmacology.

What is the passing score for the Arab Board Dermatology Part 1 exam?

The typical pass mark is approximately 60%, set by the Scientific Council of Dermatology and Venereology of the ABHS. Official pass thresholds may be adjusted using standard-setting procedures for each specific examination sitting.

Who is eligible to sit the Arab Board Dermatology Part 1 examination?

Medical doctors enrolled in recognized Arab Board residency training programs in Dermatology and Venereology who have successfully completed the required initial training period (usually the first 1 to 2 years of residency) are eligible to register upon approval by their national scientific committee.

How does the Part 1 exam differ from the Part 2 Final Exit exam?

Part 1 evaluates basic medical and cutaneous sciences, dermatopathology fundamentals, and mechanism-based pharmacology. In contrast, Part 2 is the final exit qualification focusing on advanced clinical diagnosis, patient management, complex therapeutics, procedural dermatology, and oral/OSCE clinical evaluations.